Open Radar

 
Summary: the system-wide Spotlight menu should support extension: or ext: to search for file extensions

Steps to Reproduce:
1. Click on the Spotlight menu or invoke it with Command-Space.
2. Type the following, without quotation marks: "extension:psd".

Expected Results:
The search results show all my psd files.

Actual Results:
The search returns only one result: a Messages.app message transcript wherein I described this feature to a coworker before filing the radar.

Regression:
This has never worked, and as far as I can tell, it continues not to work in the latest Mavericks dev seeds.

Notes:
There is an Extension field in the Finder's spotlight search options (pickable from the Other… menu item), but there is no textual shortcut to invoke it. You can search for kind:photoshop in the system-wide Spotlight menu, but then you also get back non-psd Photoshop files such as .tpl templates and .csh custom shapes.

I can actually get the results I would want from "kind:photoshop kind:image", but that only happens to be true in this case, and may not serve all cases. There should be a dedicated option to search by extension.